[GROOVY-7602] Intersect returns an empty list when the contents of the compared Collections are Maps

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.3.11, 2.4.5
• Fix Version/s: 2.4.7
• Component/s: groovy-jdk
• Environment: Mac OS X 10.9.5; Oracle Java 1.8.0_60
• External issue URL: https://github.com/grails/grails-core/issues/9281
• Assignee: Paul King
• Reporter: Justin Guertin
• Created: 23/Sep/15 22:46
• Updated: 12/Jun/16 08:45
• Resolved: 03/Mar/16 12:27

Description

When I compare two lists with intersect and both lists contain maps I do not get any results, even if the contents are equivalent. The test fails in Groovy 2.3.11, but passes in 2.3.7.

import org.junit.Test

class IntersectTest {
    @Test
    void testIntersect() {
        def list1 = [[language: 'Java'], [language: 'Groovy'], [language: 'Scala']]
        def list2 = [[language: 'Groovy'], [language: 'JRuby'], [language: 'Java']]
        def intersection = list1.intersect(list2)

        assert list1[0] == list2[2] // proves that there should be intersecting values
        println "Intersection: $intersection"
        assert intersection == [[language: 'Groovy'], [language: 'Java']]
    }
}

The intersect call returns an empty list in 2.3.11, resulting in the following output:

Intersection: []

Assertion failed: 

assert intersection == [[language: 'Groovy'], [language: 'Java']]
       |            |
       []           false

Issue Links

• is related to: GROOVY-7530 disjoint() does not work correctly if objects don't implement Comparable